PREPARATIONS ARE UNDERWAY FOR TOMORROW'S KANSAS CITY MARATHON. K-M-B-C NINE'S BRENDA WASHINGTON IS SCOUTING THE BEST SPOTS TO WATCH THE EVENT AND TALKING TO THOSE GETTING READY FOR IT THIS MORNING. BRENDA? AD LIB: 12-THOUSAND PEOPLE TAKING PART IN KANSAS CITY MARATHON. THIS SATURDAY. AD LIB: 12-THOUSAND PEOPLE TAKING PART IN